The objective of this study was to derive new selection indices for swine production in Quebec. First economic values were derived as change in profit per market pig for a one unit change in a trait while all other traits remain unchanged. Production figures and prices used were taken from Quebec figures. Comparing with the currently used economic values, the responses showed the same range for the sire line with a higher emphasis on age to 100 kg for the new values. The same trait, response in age to 100 kg was much smaller in the maternal line for the newly derived economic values but showed higher responses for backfat and litter size. Lean yield was found to have higher responses if used directly as a selection criterion for carcass composition instead of backfat. Feed intake was found to have unfavourable responses in the maternal line but did not change the responses for the paternal line. Including farrowing interval in the maternal line resulted in favourable responses for lean yield and litter size. Regulating the backfat level using a restricted index in the dam line had no effect on the other traits in the index.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.20573 |
| Date | January 1998 |
| Creators | Holzbauer, Regina. |
| Contributors | Cue, Roger I. (advisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Science (Department of Animal Science.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001642156, proquestno: MQ44183, Theses scanned by UMI/ProQuest. |
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